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The Merriam-Webster.com Dictionary is a unique, regularly updated, online-only reference. Although originally based on Merriam-Webster's Collegiate® Dictionary, Eleventh Edition, the Merriam-Webster.com Dictionary has since been significantly updated and expanded with new entries and revised definitions.

thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where you can find different words with same meanings to other words), sometimes as a hierarchy of broader and narrower terms, sometimes ...

The Visual Thesaurus is an online thesaurus and dictionary of over 145,000 words that you explore and visualize using an interactive map. Type in a word and the Visual Thesaurus will show you a map of synonyms, antonyms, and definitions.